ES2114912T3 - Telephone equipment with speaker that includes a circuit to suppress noise. - Google Patents

Telephone equipment with speaker that includes a circuit to suppress noise.

Info

Publication number
ES2114912T3
ES2114912T3 ES92301385T ES92301385T ES2114912T3 ES 2114912 T3 ES2114912 T3 ES 2114912T3 ES 92301385 T ES92301385 T ES 92301385T ES 92301385 T ES92301385 T ES 92301385T ES 2114912 T3 ES2114912 T3 ES 2114912T3
Authority
ES
Spain
Prior art keywords
level
signal
attenuator
speaker
local
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
ES92301385T
Other languages
Spanish (es)
Inventor
Yutaka Tomiyori
Tadashi Eguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP03045463A priority Critical patent/JP3076072B2/en
Application filed by NEC Corp filed Critical NEC Corp
Application granted granted Critical
Publication of ES2114912T3 publication Critical patent/ES2114912T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M9/00Interconnection arrangements not involving centralised switching
    • H04M9/08Two-way loud-speaking telephone systems with means for suppressing echoes or otherwise conditioning for one or other direction of traffic
    • H04M9/10Two-way loud-speaking telephone systems with means for suppressing echoes or otherwise conditioning for one or other direction of traffic with switching of direction of transmission by voice frequency
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M9/00Interconnection arrangements not involving centralised switching
    • H04M9/08Two-way loud-speaking telephone systems with means for suppressing echoes or otherwise conditioning for one or other direction of traffic

Abstract

CONTROLLED BY THE LEVEL OF A SIGNAL PRODUCED BY THE MICROPHONE (12), THE NOISE SUPPRESSION CIRCUIT (25) PROVIDES A FIRST ATTENUATOR (16) WITH A LOCAL LEVEL THAT IS THE SAME AS THE SIGNAL LEVEL AND IS SUPPRESSED AT A DEFAULT OUTPUT LEVEL WHEN THE SIGNAL LEVEL IS LOWER AND HIGHER THAN THE DEFAULT INPUT LEVEL. IN COOPERATION WITH THE GUIDE LEVEL PRODUCED BY THE SECOND ATTENUATOR (17) TO GUIDE A SPEAKER (13), THE LOCAL LEVEL MAKES THE COMPARING UNIT (21, 23) PRODUCE A CONTROL SIGNAL TO MAKE THE FIRST ATTENUATOR PROVIDE LOWER AMOUNTS AND MAJOR ATTENUATION AT THE SIGNAL LEVEL WITH THE LEVEL OF GUIDE TRANSMITTED BY THE SECOND LOW AND HIGH ATTENUATOR WHEN POSITIVE AND NEGATIVE VALUES ARE RESPECTIVELY, BY A DIFFERENCE OF ENTRY EQUAL TO THE LOCAL LEVEL LEAST. PREFERABLY, THE LOCAL LEVEL IS DELETED DUE TO THE LEVEL DIFFERENCE AT THE SIGNAL LEVEL ABOVE THE DEFAULT INPUT LEVEL.
ES92301385T 1991-02-19 1992-02-19 Telephone equipment with speaker that includes a circuit to suppress noise. Expired - Lifetime ES2114912T3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03045463A JP3076072B2 (en) 1991-02-19 1991-02-19 Loudspeaker apparatus and noise suppression circuit used in the apparatus

Publications (1)

Publication Number Publication Date
ES2114912T3 true ES2114912T3 (en) 1998-06-16

Family

ID=12720065

Family Applications (1)

Application Number Title Priority Date Filing Date
ES92301385T Expired - Lifetime ES2114912T3 (en) 1991-02-19 1992-02-19 Telephone equipment with speaker that includes a circuit to suppress noise.

Country Status (7)

Country Link
US (1) US5459786A (en)
EP (2) EP0781029B1 (en)
JP (1) JP3076072B2 (en)
AU (1) AU655626B2 (en)
CA (1) CA2061388C (en)
DE (2) DE69225258T2 (en)
ES (1) ES2114912T3 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06216986A (en) * 1993-01-19 1994-08-05 Mitsubishi Electric Corp Hand-free speech circuit
JPH07297900A (en) * 1994-04-26 1995-11-10 Mitsubishi Electric Corp Communication equipment taking countermeasure against noise sound
JP2928130B2 (en) * 1995-04-19 1999-08-03 埼玉日本電気株式会社 Hands-free communication device
US5966438A (en) * 1996-03-05 1999-10-12 Ericsson Inc. Method and apparatus for adaptive volume control for a radiotelephone
US5787165A (en) * 1996-12-13 1998-07-28 Ericsson Inc. Handsfree radiotelephone having dynamic path attenuation control for echo suppression
JP3220979B2 (en) * 1998-01-09 2001-10-22 日本電気株式会社 Voice switch
US7310420B2 (en) * 2004-04-28 2007-12-18 Gn Netcom A/S Telephone headset amplifier with noise blanking capability
CN101741965B (en) * 2008-11-27 2012-10-03 博通集成电路(上海)有限公司 Method for attenuating input signal and noise suppressing device
JP5228932B2 (en) * 2009-01-16 2013-07-03 沖電気工業株式会社 Sound signal adjustment device, program and method, and telephone device
JP5168162B2 (en) * 2009-01-16 2013-03-21 沖電気工業株式会社 Sound signal adjustment device, program and method, and telephone device
US9518241B2 (en) 2010-02-01 2016-12-13 Virginia Tech Intellectual Properties, Inc. Method of separating and de-watering fine particles
AU2011210630A1 (en) 2010-02-01 2012-08-16 Virginia Tech Intellectual Properties, Inc. Cleaning and dewatering fine coal
US8478359B2 (en) * 2010-06-04 2013-07-02 Apple Inc. User interface tone echo cancellation
US9496841B2 (en) 2010-10-21 2016-11-15 Nokia Technologies Oy Recording level adjustment using a distance to a sound source
CA2973965A1 (en) * 2011-12-31 2013-07-04 Saint-Gobain Abrasives, Inc. Abrasive article having a non-uniform distribution of openings
KR101868678B1 (en) * 2016-02-25 2018-06-18 정민시 fold-able heat chair

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135590A (en) * 1976-07-26 1979-01-23 Gaulder Clifford F Noise suppressor system
DE2907361C2 (en) * 1979-02-24 1982-06-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart, De
JPS5923668B2 (en) * 1979-03-26 1984-06-04 Oki Electric Ind Co Ltd
US4600902A (en) * 1983-07-01 1986-07-15 Wegener Communications, Inc. Compandor noise reduction circuit
JPS61195055A (en) * 1985-02-25 1986-08-29 Matsushita Electric Works Ltd Voice switching circuit for loudspeaking telephone set
US4715063A (en) * 1985-08-20 1987-12-22 Motorola, Inc. Speakerphone for radio and landline telephones
DE3570569D1 (en) * 1985-09-03 1989-06-29 Motorola Inc Hands-free control system for a radiotelephone
ES2037128T3 (en) * 1987-05-15 1993-06-16 Alcatel N.V. Voice control circuit for a telecommunication terminal.
CA1291837C (en) * 1987-07-15 1991-11-05 Juro Ohga Electronic telephone terminal having noise suppression function
US4847897A (en) * 1987-12-11 1989-07-11 American Telephone And Telegraph Company Adaptive expander for telephones
JPH01212950A (en) * 1988-02-19 1989-08-25 Matsushita Electric Ind Co Ltd Telephone system
JPH01220509A (en) * 1988-02-26 1989-09-04 Matsushita Electric Ind Co Ltd Signal suppressing circuit

Also Published As

Publication number Publication date
CA2061388A1 (en) 1992-08-20
AU1110992A (en) 1992-08-27
AU655626B2 (en) 1995-01-05
EP0781029A2 (en) 1997-06-25
DE69225258T2 (en) 1998-12-03
DE69233473D1 (en) 2005-03-03
EP0781029A3 (en) 2003-07-09
EP0500356A2 (en) 1992-08-26
JPH04264860A (en) 1992-09-21
EP0500356B1 (en) 1998-04-29
US5459786A (en) 1995-10-17
DE69225258D1 (en) 1998-06-04
DE69233473T2 (en) 2006-02-16
CA2061388C (en) 1996-06-18
EP0781029B1 (en) 2005-01-26
JP3076072B2 (en) 2000-08-14
EP0500356A3 (en) 1993-06-30

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